Following Friday’s cruise missile strike on a Syrian airbase, in retaliation for the chemical attack on Khan Sheikhoun earlier in the week, the alliance supporting Syrian President Bashar al-Assad made a joint statement threatening action in response to “any breach of red lines from whoever it is”.“What America waged in an aggression on Syria is a crossing of red lines. From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to respond well,” the group’s joint command centre said.US President Donald Trump said the strike on al Shayrat airbase, near Homs, with some 60 Tomahawk missiles was “representing the world”. The base was allegedly used by Syrian forces to conduct the attack, which killed more than 70 people.On Sunday the UK’s Defence Secretary, Sir Michael Fallon, demanded Russia rein in Mr Assad, claiming that Moscow is “responsible for every civilian death” in Khan Sheikhoun.Sir Michael said the attack had happened “on their watch” and that Vladimir Putin must now live up to previous promises that Mr Assad’s chemical weapons had been destroyed.Experts have dismissed Russia’s claim that a rebel chemical weapons facility caused the deaths.Britain, the US and France accused Mr Assad’s regime of gassing civilians in the opposition-held town, but Damascus claimed it destroyed its toxic stockpiles following an international agreement struck in 2013.